MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Waste Water Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The organisms feed on _____ in aeration tanks. |
| A. | Water |
| B. | Air |
| C. | Sludge particles |
| D. | Bacteria |
| Answer» D. Bacteria | |
| 2. |
The sludge particles concentration is increased by the growth of the organism in aeration tanks. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Mechanical stirring can be done instead of injection of air from the bottom. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
Which are the three ingredients in activated sludge systems? |
| A. | Cells, sewage and oxygen |
| B. | Cells, sewage and nitrogen |
| C. | Solids, sewage and oxygen |
| D. | Solids, water and oxygen |
| Answer» B. Cells, sewage and nitrogen | |
| 5. |
How is air pumped in the aerator unit? |
| A. | Bubbled from bottom |
| B. | Sides |
| C. | Bubbled from top |
| D. | Sprayed |
| Answer» B. Sides | |
| 6. |
An activated sludge system consists of two components, an aerator and ________ |
| A. | Screening units |
| B. | Disinfection unit |
| C. | Flocculation unit |
| D. | Clarifier |
| Answer» E. | |
| 7. |
Which of these is not an alternative to activated sludge treatment systems? |
| A. | Stabilization ponds |
| B. | Rotating biological reactors |
| C. | Trickling filter |
| D. | Screening units |
| Answer» E. | |
| 8. |
Where is the sludge at the bottom of the clarifier processed to? |
| A. | Settling unit |
| B. | Aerator |
| C. | Flocculation unit |
| D. | Disinfection unit |
| Answer» C. Flocculation unit | |
| 9. |
Which is the next reactor after activated sludge reactor in the treatment process? |
| A. | Flocculation unit |
| B. | Aeration unit |
| C. | Clarifier |
| D. | Disinfection unit |
| Answer» D. Disinfection unit | |
| 10. |
After the treatment, the BOD demand ______ |
| A. | Remains constant |
| B. | Decreases |
| C. | Increases |
| D. | Alters |
| Answer» C. Increases | |
| 11. |
________ is treated in activated sludge reactor. |
| A. | Pre-treated sludge |
| B. | Treated sludge |
| C. | Macronutrients |
| D. | Micro-organisms |
| Answer» B. Treated sludge | |
| 12. |
Why is the sludge aerated? |
| A. | To avoid bacterial growth |
| B. | To increase bacterial growth |
| C. | To maintain pH |
| D. | To maintain temperature |
| Answer» C. To maintain pH | |